class LoggingFilesystem(fileSystem: FileSystem) : ForwardingFileSystem(fileSystem) {
  fun log(line: String) {
    println(line)
  }

  override fun appendingSink(
    file: Path,
    mustExist: Boolean,
  ): Sink {
    log("appendingSink($file)")

    return super.appendingSink(file, mustExist)
  }

  override fun atomicMove(
    source: Path,
    target: Path,
  ) {
    log("atomicMove($source, $target)")

  ) {
    if (deleteFaults.contains(fileOrDirectory)) throw IOException("boom!")
    super.deleteRecursively(fileOrDirectory, mustExist)
  }

  override fun appendingSink(
    file: Path,
    mustExist: Boolean,
  ): Sink = FaultySink(super.appendingSink(file, mustExist), file)

  override fun sink(
    file: Path,
    mustCreate: Boolean,
  ): Sink = FaultySink(super.sink(file, mustCreate), file)